Magnetic Fields — Lesson 1

This lesson covers the fundamental concepts of modeling and analysis of machine. It delves into the elementary ideas of modeling electrical machines, explaining the relationship between the electrical side and the system's response. The lesson further discusses the generation of magnetic fields in electrical machines, the role of iron in enhancing these fields, and the concept of inductance. It also explains the impact of changing excitation on the magnetic field and the resulting induced EMF. The lesson uses the example of a wire loop connected to a DC supply to illustrate these concepts.

Video Highlights

00:11 - Explanation of the elementary ideas on how to model electrical machines
03:18 - Discussion on the effects of the DC and AC supply
05:41 - Demonstration of an experiment to show the existence of a magnetic field
12:47 - Explanation of the concept of magnetic flux density
17:07 - Discussion on the use of iron to increase the magnetic field
34:07 - Explanation of the concept of magneto motive force
40:24 - Discussion on the importance of inductance in determining the behavior of electrical machines

Key Takeaways

- The generation of magnetic fields in electrical machines is influenced by the flow of current and the presence of metal.
- The concept of inductance represents the interface between electrical circuits and the magnetic field.
- Changing the excitation in an electrical machine impacts the magnetic field and results in an induced EMF.
- The use of simulation software, such as finite element analysis, can help in understanding the distribution of magnetic fields in electrical machines.